Add tags/errors to trace views.

At the start or end timestamp of a transition, or at an error timestamp, colour coded tags show up
next to the relevant layer/task in the WM and SF trace hierarchy views.
Tick the transition checkbox to only show entries that have tags/errors.
Compatible with flat checkbox.

Bug: b/196544612

Test: upload the zip onto the x20 (see bug) and test above.
Change-Id: Ied84adbedc38324629c8b50178b44041f8e8b66e
10 files changed